My dad owns a 3 yr old Homelite chainsaw. he is bringing it to me to repair. The chainsaw runs great and as it warm up the idle will rise to the point were it is full throttle and you can't get it to idle down till it cools down. Do you have any suggestions on where I can start looking?
Garden - Homelite - ZR10926 16" Chain Saw
Answers & Comments
Check the throttle trigger assembly for free play. You may have to remove the handle section over the trigger to remove sawdust/dirt. Idle changes are usually due to air leakage behind the carburetor--check all fasteners on the carburetor including the ones holding the carburetor to the cylinder. Check the muffler and air cleaner for plugging. Check the cylinder for looseness to the crankcase. Check the throttle return spring on the carburetor to make sure that it is working correctly. Hope some of this helps!
There is more to it. It is a problem with heat, air entering through a crack or the fuel regulator inside the carb open and not regulating.